# Unique array elements in elasticsearch 7.4.2

**URL:** <https://discuss.elastic.co/t/unique-array-elements-in-elasticsearch-7-4-2/257847>\
**Category:** Kibana\
**Created:** [December 7, 2020, 12:34pm UTC](https://discuss.elastic.co/t/unique-array-elements-in-elasticsearch-7-4-2/257847 "2020-12-07T12:34:17Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Mohammad\_Mousavi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mohammad_mousavi/32/56508_2.png) [@Mohammad\_Mousavi](https://discuss.elastic.co/u/Mohammad_Mousavi)\
**Post date:** [December 7, 2020, 12:34pm UTC](https://discuss.elastic.co/t/unique-array-elements-in-elasticsearch-7-4-2/257847/1 "2020-12-07T12:34:18Z")

</div>

Hi, I've found this [post](https://discuss.elastic.co/t/unique-array-elements-in-painless-script/66519) and I think it's a little old. I run this code in elasticsearch 7.4.2 :

```
POST logstash-vod-2020.11/_update_by_query?conflicts=proceed&refresh
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "tags.keyword": "SomeTag"
          }
        }
      ]
    }
},
 "script": {
    "inline": "ctx._source.ts_duration=ctx._source.ts_duration.stream().distinct().sorted().collect(Collectors.toList())"
  }
}

```

and I get this error:

```
{
  "error": {
    "root_cause": [
      {
        "type": "script_exception",
        "reason": "runtime error",
        "script_stack": [
          "ctx._source.ts_duration=ctx._source.ts_duration.stream().distinct().sorted().collect(Collectors.toList())",
          " ^---- HERE"
        ],
        "script": "ctx._source.ts_duration=ctx._source.ts_duration.stream().distinct().sorted().collect(Collectors.toList())",
        "lang": "painless"
      }
    ],
    "type": "script_exception",
    "reason": "runtime error",
    "script_stack": [
      "ctx._source.ts_duration=ctx._source.ts_duration.stream().distinct().sorted().collect(Collectors.toList())",
      " ^---- HERE"
    ],
    "script": "ctx._source.ts_duration=ctx._source.ts_duration.stream().distinct().sorted().collect(Collectors.toList())",
    "lang": "painless",
    "caused_by": {
      "type": "illegal_argument_exception",
      "reason": "dynamic method [java.lang.Integer, stream/0] not found"
    }
  },
  "status": 400
}

```

I try **source** instead of **inline** but I get same error. what is the problem ? thanx

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 4, 2021, 12:34pm UTC](https://discuss.elastic.co/t/unique-array-elements-in-elasticsearch-7-4-2/257847/2 "2021-01-04T12:34:26Z")

</div>

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